another question...
Which of the following data, in addition to the Pseudo Random Noise (PRN) code, forms part of the so called Navigation Message transmitted by NAVSTAR/GPS satellites?
a)Time; data to impair the accuracy of the position fix (Selective Availability SA)
b)Almanac data; satellite status information
c)Data to correct receiver clock error; almanac data
d)Time; position of the satellites
answer given is B I wonder what is wrong with D? an excerpt from oxford ATPL says:-
The information contained in the nav and system data message is:
SV position
SV clock time
SV clock error
Information on ionospheric conditions
Supplementary information, including the almanac (orbital parameters for the SVs), SV
health (P-code only) correlation of GPS time with UTC and other command and control
functions.
so how does it not give time(or SV clock time)and position of sattelites(almanac) i.e. D?
